gdk-sharpGtk# is thread aware, but not thread safe; See the Gtk# Thread Programming for details.System.EnumGLib.GType(typeof(Gdk.PropModeGType))Describes how existing data is combined with new data.None.FieldGdk.PropModeThe new data is appended to the existing data.FieldGdk.PropModeThe new data is prepended to the existing data.FieldGdk.PropModeThe new data replaces the existing data.